Step-by-step explanation:
decrease T = eq shifts left, because youre taking energy from the system and this is an endothermic reaction, it needs energy to make products = co2 concentration decreases
add CO = eq shifts right, because you're adding reactants in the equilibrium = i2o5 concentration decreases
increase i2o5 = same = can't affect T
decrease co2 = eq shifts right, because by
decreasing co2 you'll have less of this product than you normally have in the equilibrium, then eq will shift toward making more product = both reactants, CO and I2O5 decrease their concentration because they're being used to shift equilibrium right